R
redacted
Guest
Here's a list of the cylinders made with 6351 T6 aluminium.
List of Scuba Tanks Made From 6351-T6 Alloy
This alloy has a problem with sustained load cracking, and may fail explosively. Any cylinder made before 1990 is suspect, and many dive shops will not service or fill any aluminium cylinder made before then.
Here's the homepage. (some photos can be gory if you follow the links)
The Latest Victim of 6351-T6 Scuba Tanks
So, tell us. what motivated this public service announcement?